Micrometer-caliper.



ANTONIO EEANsosI, OE PROVIDENCE,

GEORGE A. SHELTEA, OF

RHODE ISLAND, ASSIGNOR OF ONE-HALF T0 PROVIDENCE, RHODE ISLAND.

MICROIVIETER-CALIPER.

Specification of Letters Patent.

Patented Feb. 20, 1917.

Application filed July 19, 1916. Serial No. 110,255.

To all wwm t may concern:

Be it known that I, ANTONIO FRANsosI, a citizen of the United States,andresident of the city of Providence, in the county of Providence andState of Rhode Island, have invented certain new and useful Improvementsin Micrometer-Calipers, of which the following is a specification.

This invention relates to micrometer calipers and has for its object toprovide such a caliper that is simple and practical in construction andone which is provided with an extremely long operating stroke.

A further object of the invention is `to With these and other objects inview, the invention consists of certain novel features of construction,as will be more fully described, and particularly pointed out in theappended claims.

In the accompanying drawings:

Figure l* is a side elevationv of my improved caliper showing the partsassembled and the graduations on the feed bar and handle.

Fig'. 2* is a sectional side elevation of the sleeve member.

Fig. 3* is an end view ber sectioned on line 3*?) of F ig.I 2.

Fig. 4* is a sectional side. elevation of the feed bar showing the sameinteriorly threaded and with its pair of keys to slide in correspondingkeyways in the sleeve member.

Fig. 5* is a tapered nut for engaging the correspondingly threaded endof the feed r taking up the wear of the thread and tightening the sameabout the feed screw.

Fig. 6* is a sectional view on line 6*6 of Fig. 4 showing the pair ofkeys set into the feed bar.

of the sleeve mem Fig. 7* is a side elevation of the feed th screw.

Fig. 8* is an enlarged sectionalside elevation showing the operatingmechanism.

Referring to the same being formed preferably simplicity in theconstruction of the operating mechanism and the facility with which thewear of the working parts may be taken up by adjustment.

Another feature is which the cost of making' the complish this I form asleeve member 13 separate from the bar rel portion, which has a bodyportion 141 turned to fit into the barrel 12. This body portion isprovided also with an enlarged bearing portion 15 which performs adouble function; first, it provides a shoulder as at 16 for limiting ordetermining the distance it shall be forced into the barrel portion;second, its outer surface serves as a bearing for the operating handle,presently described, the outer end portion of this sleeve is threadedyas at 17.

This sleeve has-a central bore 18 extending from its inner end nearlythrough it and a larger bore 19 extending from the opposite end inwardto meet it.

A feature in the construction of this sleeve member is that two Oppositeslots 2O and 21 are formed longitudinally along the body of the same, inwhich slide the keys 23 presently `described and which slo-ts extendthrough the body into the middle bore, the by a rotating saw whichpasses completely through the sleeve, the corners being squared up afterthe cut is made. Next av feed bar 22 is fitted to slide in the bore ofthe sleeve and this bar is provided with two keys 23 which arepreferably formed by Erst slotting the end portion. The larged portionis provided with a smaller `screw into the outer portion 30 and theouter end -of this feed screw is threaded as at 31 for the purposepresently described.

ln order to sleeve against a relative endwise movement I have provided anut 32 which screws onto the threaded portion 17 of the sleeve andbrings up against a check nut 33 also on this threaded portion 17,whereby the wear on the enlarged portion 27 of the screw against theshoulder 29 may be readily adjusted or taken up and locked in positionby the loc nut 32 so that the micrometer readings will at all times beaccurate.

The operating handle 34 ischambered out so as to lit over this lockingnut 32 and receive a bearing at 35 on the sleeve on which it may befreely rotated and in order to secure this handle to the feed screw Ihave threaded the outer portion 31 of the feed end of this handle andhave provided a nut 36 threaded onto the extremity of the feed screw,whereby it may be set up against the end of the handle to securely lockthe same in position thereon.

lt will be noted that the construction of my improved micrometer caliperis eX- tremely simple and inexpensive, is 'positive in its action andthe wear of the operating vparts may be readily `adjusted and taken up,one of the adjustments being the tapering nut 25 by which the threadedpo-rtion of the feed bar may be contracted about the feed screw 26 tocompensate for any wear between these members; and second, the nut 32may be adjusted on the threaded portion 17 of the sleeve to take up, anyrelative endwise movement of the screw and this nut 32 is securelylocked in its adjusted position by the check nut 33, thereby insuringaccurate reading of the instrument at all times.

rilhen again by this construction the stroke or opening capacity of thecaliper is very great and yet the parts have long bearings to preserveaccurate alinement.

Copies of this patent may be obtained for lock the feed screw to the vecents each, by addressing the In order to provide easy reading for thecaliper, I have graduated the outside surface of the feed bar as at 37,see Fig. 1, and 1 have also graduated the inner beveled end 3S of theoperating handle 34:.

I have described and illustrated one embodiment of my invention but thedetails of construction may be varied without departing lfrom the spiritand scope of my invention., the scope of the invention being dciined andlimited only by the appended claims.

I claim:

1. A. micrometer caliper comprising a frame, a barrel portion connectedto said frame, a sleeve fitted in said barrel and provided with alongitudinal keyway, a feed bar slidable endwise in said sleeve, andprovided with a key engaging said keyway, a feed screw for operatingsaid bar, said screw member being provided with an enlarged shoulderedportion for determining the position of said sleeve in the barrel, awear take up lock nut for securing` said screw to said sleeve against arelative endwise motion, and an operating handle secured to said screw.

2. A micrometer caliper comprising a frame, a barrel portion carriedthereon, a sleeve fitted in said barrel and provided with a pair oflongitudinal slots and an enlarged shouldered portion for determiningthe positio'n of the sleeve in the barrel, a feed bar slidable endwisein said sleeve, and provided with a pair of keys engaging said slots, afeed screw for operating said bar, said screw member being provided withan enlrgedportion shouldered in said sleeve, a \ke up lock nut forsecuring said screw to said sleeve against a relative endwise motibn,and an operating handle secured to said screw and bearing on saidenlarged shouldered portion on said sleeve.

1n testimony whereof 1 affix my signature.

ANTGNO FRANSOSL Commissioner of Iatents,

Washington, D. C.

